Electromagnetic and Mechanical Analysis of High Speed SPM Rotor with Copper Shield

Mahir Al-ani, Simon Barrans, Jeff Carter

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Citations (Scopus)


For high-speed applications, the surface-mounted permanent magnet (SPM) machine is preferred due to its high torque density and efficiency. However, induced eddy currents in the rotor conductive parts result in a loss of efficiency and rotor heating. Therefore, several methods to reduce such losses have been proposed in the literature including copper shielding. In this paper, a high-speed SPM machine rotor with a copper shield is designed and investigated both electromagnetically and mechanically. Several quantitative investigations including placing the copper sheet around the retaining sleeve or magnets, different copper sheet and airgap thicknesses, different retaining sleeve materials, different harmonic contents in the current waveform, i.e. pulse amplitude modulation (PAM) and pulse width modulation (PWM) generated waveforms, and different frequencies and current levels are reported. Additionally, a mechanical analysis investigating possible failure modes of the rotor with the copper sheet is reported.
Original languageEnglish
Title of host publication2017 IEEE International Electric Machines and Drives Conference (IEMDC)
Number of pages8
ISBN (Electronic)9781509042814
Publication statusPublished - 8 Aug 2017
EventIEEE International Electric Machines & Drives Conference 2017 - Miami, United States
Duration: 21 May 201724 May 2017
http://iemdc.org/ (Link to Conference Website )


ConferenceIEEE International Electric Machines & Drives Conference 2017
Abbreviated titleIEMDC 2017
Country/TerritoryUnited States
Internet address


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